Hi there, @Divibeeboh !
Thank you for joining this thread.
I understand that you are experiencing a similar issue. Kindly review the troubleshooting steps that I shared earlier in order to hopefully resolve the issue. You may also want to reach out to PayStack to ensure that your account is set up correctly.
If you are still experiencing this error, we may need to access your account to gather more information. While we are unable to provide account-specific support through the Community Forums, we would be happy to continue assisting you through our Help Center. To access our live support, you can ask the Virtual Shopify Assistant to “contact support.” It will then guide you on the next steps to connect with a team member who can assist you further.
Let me know how that goes!